software/kvm: use nice/ionice to run import with lower priority

software/kvm/buildout.hash.cfg

@@ -31,7 +31,7 @@ md5sum = 839fc16c112d3b87e2dbd2e382e326de
 
 [template-kvm-import]
 filename = instance-kvm-import.cfg.jinja2.in
-md5sum = a463a5e3cd2287d275d6943c2a11b7e4
+md5sum = 5540d058f7842466a1fc61bf94239b61
 
 [template-kvm-import-script]
 filename = template/kvm-import.sh.jinja2

software/kvm/instance-kvm-import.cfg.jinja2.in

@@ -61,8 +61,8 @@ cronstamps = ${:etc}/cronstamps
 recipe = slapos.recipe.template:jinja2
 url = {{ template_kvm_import }}
 output = ${directory:bin}/${slap-parameter:namebase}-importer
-# Resilient stack wants a "wrapper" parameter
-wrapper = ${:output}
+wrapper =
+    nice -19 chrt --idle 0 ionice -c3 ${:output}
 context =
     section directory directory
     raw zcat_binary {{ zcat_binary }}
@@ -77,7 +77,7 @@ input = inline:#!/bin/sh
   if [ ! -s "$QEMU_IMAGE" ]; then
     exit 0
   fi
-  {{ qemu_location }}/bin/qemu-img check $QEMU_IMAGE
+  nice -19 chrt --idle 0 ionice -c3 {{ qemu_location }}/bin/qemu-img check $QEMU_IMAGE
   RETURN_CODE=$?
   if [ $RETURN_CODE -eq 0 ] || [ $RETURN_CODE -eq 3 ]; then
     exit 0